KI,AS.M(ilii;.\N(liS. 



KKiil 



low l)iit hriiad, iiirdi.illy rdiivcx ami latiTiilly L-oiicaAc, On the nutsidc (if tlic lateral rranial walls iIhtc lie in 



lire set one on each siile n\' ihe lui-anien niai;iiiini. , this region the nioi-c or less marked articadiif cavities 



,■111(1 a c(iri'cs|i(indinL; ciindx le, nieiliallv conca\'e and of the hyoniMiidibular cui-tilage (liiii). 'l'liroii;.di the 



liitcralh' convex, is set on the front ^ide of the con- leniporal i-egion pass the foramina lor the iicrnis ijlos- 



tlneiit N'ei'teliral mass at ihe lie^innini;' of the spinal 1 sojil/iiri/iif/eKS (fig. 21IS, (\ 1//1), )i. /(irialis (fig. 300, 



I'oluinn (fig. "ilU, li). ; /«), and, at the lioiindary l)etween it and the orbital 



The temporal region snrronnds the parts of the region, for the 11. t lificDihiKf (fr). 



labyrinth, and frecinently shows trace.s (elevations), j The orbital region is furnished on eac'li .side in 



even on the snrfaee, of the position within the carti- the most primitive forms with a posterior articular 



lage of the laliyrintliine c;inals (fio-. 2!IS, asc, psc, and I cavity for the palatine cai-tilag(! of the np])er jaw (jia- 



. '/i/l/f / 



Fig. 207. First ddrsid tin with its skeletal parts imil \\\v siiliincciit purl (pf the spiniil (•(ihiiiiii in an Astcrosiiunilylc (H.assk). a Porhcaglc 

 (Isurus cornubiciis), 213 cni. Idiit:. fmni tin- Nortli Sea. ' , of tin- n.itiiral size. 



ra, rarlialia of tlii-- anterior margin; rb, basal radialia; J'h, bnnelies «i fibrils, partly inserted between the distal radialia; riiU, nietapterygoid 

 radiidia, with their distal sections (rmU — rmt^); Ig, vertical ligament of the dorsal fin, investing in its lower part (/y, ) the elastic ligament 

 of the spinal cohmin (/<■) — the last ligament is partly removed to show the roof of the spinal canal, composed partlj' of the intemcnral arches, 

 partly of special snpraspin.1l cartilages; in, intcrnenral cartilages; m). neuraiiophyses; c, vertebno. complete, amphiooelous, with longitudinal 

 lateral cavities and ribbed; monospondylous, each vertebra answering to only one neurapopliysis; /in, hwmapophyses; //;, interhiemal cartilages; 

 the two last-mentioned cartilages together forming on each side of the spinal column a rim projecting outwards and downwards (answering 



to /( ill the preceding figure). 



hsc) and the vestilnde. On the upper side of the lato(|uadrate cartilage) on a postorbital pi-ocess, and with 



skull (tigs. 2!IS — 300) this region is usually depressed an anterior articular cavity for the same cai-tilage at 



into a parietal cavity, where the two endolymphatic the bottom of the orbit, on an expansion of the cranial 



ducts or aijiKechtrtus rfsllhidl (aiji) have their orifices. ! cartilage which has been called the basal disk, and which 



